﻿GAJ 
  BEDS. 
  35 
  

  

  indurated 
  ash 
  occurs 
  in 
  the 
  lateritic 
  area 
  about 
  three 
  miles 
  south-west 
  

   of 
  Asota. 
  The 
  second 
  variety 
  mentioned 
  above 
  may 
  be 
  seen 
  to 
  the 
  

   east 
  of 
  Visawara 
  above 
  Porbandar. 
  

  

  Much 
  of 
  the 
  ferruginous 
  red 
  or 
  mottled 
  earthy 
  rock 
  has 
  the 
  appear- 
  

   ance 
  of 
  decomposed 
  and 
  lateritized 
  volcanic 
  ash; 
  that 
  at 
  Tukra 
  near 
  

   Miani,— 
  in 
  the 
  form 
  of 
  craggy 
  hillocks, 
  or 
  rising 
  ground, 
  sometimes 
  sup- 
  

   porting 
  a 
  remnant 
  or 
  thin 
  capping 
  of 
  tertiary 
  beds, 
  — 
  contains 
  semi-crys- 
  

   talline 
  lumps 
  of 
  a 
  white 
  partially 
  decomposed 
  mineral, 
  which 
  is 
  probably 
  

   of 
  secondary 
  origin 
  ; 
  it 
  is 
  too 
  much 
  altered 
  for 
  recognition. 
  The 
  same, 
  

   or 
  very 
  similar, 
  rock 
  appears 
  about 
  the 
  middle 
  of 
  the 
  lateritic 
  section 
  in 
  

   the 
  hills 
  on 
  the 
  west 
  of 
  Asota. 
  About 
  a 
  mile 
  north 
  -by-west 
  of 
  Bhatia, 
  

   the 
  dark-red 
  ferruginous 
  rock 
  presents 
  the 
  appearance 
  of 
  a 
  porphyry, 
  as 
  

   it 
  contains 
  a 
  white 
  steatitic, 
  or 
  kaolinic 
  mineral, 
  in 
  the 
  form 
  of 
  decom- 
  

   posed 
  crystals, 
  scattered 
  through 
  the 
  mass. 
  

  

  It 
  is 
  evident 
  that 
  the 
  lateritic 
  formation 
  must 
  have 
  been 
  subjected 
  

  

  to 
  a 
  considerable 
  amount 
  of 
  denudation, 
  prior 
  to 
  

   Thickness. 
  . 
  . 
  •'■,■, 
  

  

  the 
  deposition 
  or 
  the 
  sedimentary 
  tertiary 
  beds 
  

  

  in 
  Kathiawar; 
  for 
  its 
  average 
  thickness 
  does 
  not 
  probably 
  exceed 
  50 
  

  

  feet, 
  while 
  there 
  are 
  places 
  where 
  such 
  extremes 
  as 
  200 
  — 
  250 
  feet 
  are 
  

  

  reached. 
  

  

  The 
  material 
  of 
  the 
  rocks 
  of 
  this 
  formation 
  has 
  undergone 
  so 
  much 
  

  

  change, 
  by 
  decomposition 
  and 
  ( 
  lateritization 
  ' 
  (if 
  

  

  Volcanic 
  origin. 
  

  

  I 
  may 
  be 
  allowed 
  the 
  term), 
  that 
  its 
  original 
  

   aspect, 
  or 
  primary 
  condition, 
  has 
  ever 
  been 
  a 
  subject 
  of 
  conjecture 
  and 
  

   speculation 
  ; 
  but 
  there 
  appears 
  good 
  evidence, 
  in 
  the 
  character 
  of 
  some 
  

   of 
  the 
  Kathiawar 
  rock, 
  that 
  the 
  original 
  material 
  was 
  mostly 
  volcanic 
  

   ejectamenta, 
  and 
  that 
  the 
  group 
  represents 
  an 
  eruption 
  subsequent 
  to, 
  

   and 
  differing 
  in 
  many 
  respects 
  from, 
  the 
  trap 
  out-flows. 
  

  

  Gdj 
  beds. 
  — 
  The 
  post-trappean 
  formations 
  occupy 
  the 
  margin, 
  or 
  border 
  

   land, 
  of 
  the 
  trappean 
  area 
  in 
  the 
  southern 
  half 
  of 
  the 
  province, 
  having 
  

   the 
  coast 
  line 
  for 
  its 
  outer 
  boundary. 
  This 
  belt 
  of 
  country 
  averages 
  

   about 
  seven 
  miles 
  in 
  breadth. 
  No 
  Gaj, 
  or 
  other 
  tertiary, 
  beds 
  occur 
  along 
  

  

  r 
  10? 
  ) 
  

  

  